chief

nouns

a person who is in charge
"the head of the whole operation"
chief, head, top dog
a person who exercises control over workers
"if you want to leave early you have to ask the foreman"
boss, chief, foreman, gaffer, honcho
the head of a tribe or clan
chief, chieftain, headman, tribal chief

adjectives

most important element
"the chief aim of living"; "the main doors were of solid glass"; "the principal rivers of America"; "the principal example"; "policemen were primary targets"; "the master bedroom"; "a master switch"
chief, main, master, primary, principal